From 5ddf0eb2bfd613e941dd8748870c71da2e5ad409 Mon Sep 17 00:00:00 2001
From: Robert Olsson <robert.olsson@its.uu.se>
Date: Mon, 20 Mar 2006 21:34:12 -0800
Subject: [PATCH] [IPV4]: fib_trie initialzation fix

In some kernel configs /proc functions seems to be accessed before the
trie is initialized. The patch below checks for this.

Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/fib_trie.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index e320b32373e5..8aa31fe514ee 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -50,7 +50,7 @@
  *		Patrick McHardy <kaber@trash.net>
  */
 
-#define VERSION "0.404"
+#define VERSION "0.405"
 
 #include <linux/config.h>
 #include <asm/uaccess.h>
@@ -2040,7 +2040,15 @@ rescan:
 static struct node *fib_trie_get_first(struct fib_trie_iter *iter,
 				       struct trie *t)
 {
-	struct node *n = rcu_dereference(t->trie);
+	struct node *n ;
+
+	if(!t)
+		return NULL;
+
+	n = rcu_dereference(t->trie);
+
+	if(!iter)
+		return NULL;
 
 	if (n && IS_TNODE(n)) {
 		iter->tnode = (struct tnode *) n;
-- 
2.39.5